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Science 15 September 2000:
Vol. 289. no. 5486, pp. 1906 - 1909
DOI: 10.1126/science.289.5486.1906
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Reports

Optically Induced Entanglement of Excitons in a Single Quantum Dot

Gang Chen,1 N. H. Bonadeo,1* D. G. Steel,1 † D. Gammon,2 D. S. Katzer,2 D. Park,2 L. J. Sham3

Optically induced entanglement is identified by the spectrum of the phase-sensitive homodyne-detected coherent nonlinear optical response in a single gallium arsenide quantum dot. The electron-hole entanglement involves two magneto-excitonic states differing in transition energy and polarization. The strong coupling needed for entanglement is provided through the Coulomb interaction involving the electrons and holes. The result presents a first step toward the optical realization of quantum logic operations using two or more quantum dots.

1 Harrison M. Randall Laboratory of Physics, University of Michigan, Ann Arbor, MI 48109-1120, USA.
2 The Naval Research Laboratory, Washington, DC 20375, USA.
3 Department of Physics, University of California San Diego, La Jolla, CA 92093-0319, USA.
*   Present address: Bell Laboratories, 101 Crawfords Corner Road, Holmdel, NJ 07733, USA.

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Near-Field Coherent Spectroscopy and Microscopy of a Quantum Dot System.
J. R. Guest, T. H. Stievater, G. Chen, E. A. Tabak, B. G. Orr, D. G. Steel, D. Gammon, and D. S. Katzer (2001)
Science 293, 2224-2227
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